Preparation method and application of flow pattern regulator for oil-based drilling fluid

Abstract

The application provides a preparation method of a flow pattern regulator for oil-based drilling fluid, comprising: carrying out a first reaction on a polybasic acid and a polyamine A to obtain a first reaction product; carrying out a second reaction on the first reaction product and a polyamine B to obtain a second reaction product; and carrying out a third reaction on the second reaction product and a diluent to obtain the flow pattern regulator for oil-based drilling fluid. The anti-high-temperature oil-based flow pattern regulator prepared by the method can adjust the rheological property of oil-based drilling fluid, the temperature resistance of the flow pattern regulator is improved by introducing a polybasic acid containing a long-chain alkyl group and a benzene ring structure into the molecule of the flow pattern regulator. The oil-based flow pattern regulator prepared by the application has good temperature resistance and long action time, can significantly improve the rheological property of oil-based drilling fluid under high-temperature conditions, improve the shear force and suspension stability of the drilling fluid, and solve the problems of poor barite sedimentation and rock carrying capacity of high-temperature and high-density oil-based drilling fluid. The application further provides an oil-based drilling fluid.

Description

TECHNICAL FIELD

[0001] The present application belongs to the technical field of drilling fluid treating agent, in particular to a preparation method and application of a flow pattern regulator for oil-based drilling fluid, which is used in the drilling process of strong water-sensitive formations and shale gas horizontal wells. BACKGROUND

[0002] In the complex drilling process of strong water-sensitive formations and shale gas horizontal wells, the use of water-based drilling fluid system is prone to clay hydration and dispersion, causing wellbore instability and affecting downhole construction safety. Clay does not hydrate and disperse in oil-based drilling fluid, which is conducive to wellbore stability, and oil-based drilling fluid also has the advantages of good lubricity and small formation damage, and has been widely used in drilling of various complex formations. However, oil-based drilling fluid generally has low shear force and poor suspension, which not only affects the carrying effect of drilling fluid, but also easily causes barite sedimentation at high density. In order to ensure that the oil-based drilling fluid has appropriate shear force, a flow pattern regulator is generally added to the drilling fluid to increase the shear force of the system and improve the suspension stability of the oil-based drilling fluid.

[0003] At present, the commonly used shear enhancer is generally an organic soil modifier, but its dosage in oil-based drilling fluid is large and the shear enhancing effect is limited. In addition, there is also an amide shear enhancer, but this shear enhancer has insufficient temperature resistance, especially under long-term high-temperature aging conditions (more than 48h), the shear performance of the treatment agent decreases significantly, which is difficult to guarantee the suspension stability requirements of high-temperature and high-density oil-based drilling fluid. SUMMARY

[0004] Therefore, the purpose of the present application is to provide a preparation method and application of a flow pattern regulator for oil-based drilling fluid. The flow pattern regulator prepared by the present application has good temperature resistance and meets the performance requirements of high-temperature and high-density oil-based drilling fluid.

[0005] The present application provides a preparation method of a flow pattern regulator for oil-based drilling fluid, comprising:

[0006] a first reaction of a polybasic acid and a polyamine A to obtain a first reaction product;

[0007] a second reaction of the first reaction product and a polyamine B to obtain a second reaction product;

[0008] a third reaction of the second reaction product and a diluent to obtain a flow pattern regulator for oil-based drilling fluid;

[0009] The polyamine A is selected from one or more of N,N-di(3-aminopropyl)dodecylamine, N,N-di(3-aminopropyl)tetradecylamine, N,N-di(3-aminopropyl)hexadecylamine, N,N-di(3-aminopropyl)octadecylamine and N,N-di(3-aminopropyl)oleylamine.

[0010] The polyamine B is selected from one or more of m-phenylenediamine, p-phenylenediamine and 2,4,6-triethylbenzenetriamine.

[0011] Preferably, the polyacid is selected from one or more of dimer fatty acid and trimer fatty acid.

[0012] Preferably, the molar ratio of the polyacid and the polyamine A is 1:(0.1-2).

[0013] Preferably, the temperature of the first reaction is 100-150℃.

[0014] Preferably, the molar ratio of the polyacid and the polyamine B is 1:(0.1-0.5).

[0015] Preferably, the temperature of the second reaction is 160-200℃.

[0016] Preferably, the diluent is selected from one or more of laurylamine polyoxyethylene ether, oleylamine polyoxyethylene ether and octadecylamine polyoxyethylene ether.

[0017] Preferably, the mass of the diluent is 50-150% of the total mass of the polyacid, the polyamine A and the polyamine B.

[0018] Preferably, the temperature of the third reaction is 80-100℃.

[0019] The present application provides an oil-based drilling fluid, comprising: the oil-based drilling fluid rheological modifier prepared by the method.

[0020] The method provided by the present application prepares the high-temperature-resistant oil-based rheological modifier which can adjust the rheology of oil-based drilling fluid. By introducing the polyamine containing long-chain alkyl and benzene ring structure into the molecule of the rheological modifier, the temperature resistance of the rheological modifier is improved. The oil-based drilling fluid rheological modifier prepared by the present application has good temperature resistance and long action time, can significantly improve the rheology of oil-based drilling fluid under high temperature, improve the shear force and suspension stability of the drilling fluid, and solve the problems of barite sedimentation and poor rock carrying capacity of high-temperature high-density oil-based drilling fluid. DETAILED DESCRIPTION

[0021] The technical solutions in the embodiments of the present application will be described clearly and completely below. Obviously, the described embodiments are only a part of the embodiments of the present application, rather than all the embodiments. Based on the embodiments in the present application, all other examples improved or polished by those skilled in the art belong to the scope of protection of the present application. It should be understood that the embodiments of the present application are only used to illustrate the technical effects of the present application, and are not used to limit the protection scope of the present application. In the embodiments, the methods used are conventional methods if not specifically stated.

[0022] The present application provides a preparation method of a flow pattern regulator for oil-based drilling fluid, comprising:

[0023] carrying out a first reaction on the polybasic acid and polyamine A to obtain a first reaction product;

[0024] carrying out a second reaction on the first reaction product and polyamine B to obtain a second reaction product;

[0025] carrying out a third reaction on the second reaction product and a diluent to obtain the flow pattern regulator for oil-based drilling fluid.

[0026] In the present application, the polybasic acid is preferably selected from one or several of dimerized fatty acid and trimerized fatty acid.

[0027] In the present application, the polyamine A is selected from one or several of N,N-di(3-aminopropyl)dodecylamine, N,N-di(3-aminopropyl)tetradecylamine, N,N-di(3-aminopropyl)hexadecylamine, N,N-di(3-aminopropyl)octadecylamine and N,N-di(3-aminopropyl)oleylamine.

[0028] In the present application, the molar ratio of the polybasic acid and polyamine A is preferably 1:(0.1-1), more preferably 1:(0.2-0.8), more preferably 1:(0.3-1.6), and most preferably 1:(0.4-0.5).

[0029] In the present application, the first reaction is preferably carried out under stirring; the temperature of the first reaction is preferably 100-150°C, more preferably 110-140°C, and most preferably 120-130°C; and the time of the first reaction is preferably 10-60 min, more preferably 20-50 min, and most preferably 30-40 min.

[0030] In the present application, the polyamine B is selected from one or several of m-phenylenediamine, p-phenylenediamine and 2,4,6-triethylbenzenetriamine.

[0031] In the present application, the molar ratio of the polybasic acid and polyamine B is preferably 1:(0.1-0.5), more preferably 1:(0.2-0.4), and most preferably 1:0.3.

[0032] In the present application, the temperature of the second reaction is preferably 160-200°C, more preferably 170-190°C, and most preferably 180°C; and the time of the second reaction is preferably 60-120 min, more preferably 80-100 min, and most preferably 90 min.

[0033] In the present application, the diluent is preferably selected from one or more of lauryl amine polyoxyethylene ether, oleyl amine polyoxyethylene ether and octadecyl amine polyoxyethylene ether; the number of units of the polyoxyethylene chain structure in the lauryl amine polyoxyethylene ether is preferably 5-10, more preferably 5 or 10; the number of units of the polyoxyethylene chain structure in the oleyl amine polyoxyethylene ether is preferably 5-10, more preferably 5 or 10; the number of units of the polyoxyethylene chain structure in the octadecyl amine polyoxyethylene ether is preferably 5-10, more preferably 5 or 10.

[0034] In the present application, the mass of the diluent is preferably 50%-150% of the total mass of the polybasic acid, polyamine A and polyamine B, more preferably 80%-120%, and most preferably 100%.

[0035] In the present application, the third reaction is preferably carried out under stirring; the temperature of the third reaction is preferably 80-100℃, more preferably 85-95℃, and most preferably 100℃; the time of the third reaction is preferably 10-30min, more preferably 15-25min, and most preferably 10min.

[0036] In the present application, after the completion of the third reaction, preferably further comprising:

[0037] The obtained reaction product is cooled to room temperature.

[0038] The present application provides an oil-based drilling fluid drilling fluid, comprising: the oil-based drilling fluid flow modifier prepared by the method described in the above technical solution.

[0039] The present application does not have special restrictions on the composition of the oil-based drilling fluid, and those skilled in the art can prepare the drilling fluid with the required components according to the actual needs, and then add the oil-based drilling fluid flow modifier.

[0040] In the present application, the mass content of the oil-based flow modifier in the oil-based drilling fluid is preferably 0.3-1.5%, more preferably 0.5-1%, and most preferably 0.6-0.8%.

[0041] The oil-based drilling fluid flow modifier prepared by the present application has good temperature resistance and long action time, can significantly improve the rheological property of the oil-based drilling fluid under high temperature conditions, improve the shear force and suspension stability of the drilling fluid, and solve the problems of barite sedimentation and poor rock carrying capacity of high-density oil-based drilling fluid under high temperature conditions.

[0042] Example 1

[0043] Into a reactor, 1 mol of trimer acid and 1 mol of N,N-di(3- aminopropyl)tetradecylamine were added, and the solution was heated to 150°C under stirring for 10 min. Then, 0.1 mol of 2,4,6-triethylbenzenetriamine was added into the reactor, and the solution was heated to 160°C for 120 min. Then, the solution was cooled to 80°C, and 100% of octadecylamine polyoxyethylene ether (the number of units of polyoxyethylene chain structure is 10) based on the total weight of the raw materials was added into the solution, and the solution was stirred for 10 min. Then, the solution was cooled to room temperature to obtain an oil-based drilling fluid flow regulator sample.

[0044] Example 2

[0045] Into a reactor, 1 mol of trimer acid and 1 mol of N,N-di(3- aminopropyl)tetradecylamine were added, and the solution was heated to 150°C under stirring for 10 min. Then, 0.1 mol of 2,4,6-triethylbenzenetriamine was added into the reactor, and the solution was heated to 160°C for 120 min. Then, the solution was cooled to 80°C, and 100% of octadecylamine polyoxyethylene ether (the number of units of polyoxyethylene chain structure is 10) based on the total weight of the raw materials was added into the solution, and the solution was stirred for 10 min. Then, the solution was cooled to room temperature to obtain an oil-based drilling fluid flow regulator sample.

[0046] Example 3

[0047] Into a reactor, 1 mol of trimer acid and 1 mol of N,N-di(3- aminopropyl)tetradecylamine were added, and the solution was heated to 150°C under stirring for 10 min. Then, 0.1 mol of 2,4,6-triethylbenzenetriamine was added into the reactor, and the solution was heated to 160°C for 120 min. Then, the solution was cooled to 80°C, and 100% of octadecylamine polyoxyethylene ether (the number of units of polyoxyethylene chain structure is 10) based on the total weight of the raw materials was added into the solution, and the solution was stirred for 10 min. Then, the solution was cooled to room temperature to obtain an oil-based drilling fluid flow regulator sample.

[0048] Examples 4-6

[0049] The oil-based drilling fluid flow regulator sample was prepared according to the method of Example 1, except that the reaction raw materials and amounts used in Examples 4-6 were used.

[0050] Table 1 Reaction raw materials and amounts used in preparing the regulator in Examples 4-6

[0051]

[0052] Performance test

[0053] The oil-based drilling fluid flow regulator prepared in the examples was added into the oil-based drilling fluid base slurry for performance evaluation.

[0054] The oil-based drilling fluid base slurry formula: 320 mL diesel oil + 80 mL CaCl2 solution (25% mass concentration) + 28 g emulsifier (LEMUL emulsifier produced and sold by Zhongyuan Petroleum Engineering Company) + 12 g organic clay + 10 g oxidized asphalt + 8 g CaO, and barite is added to 1.6 g / cm 3 .

[0055] A sample was taken as a blank sample, and the other six samples were respectively added with 2 g of the flow type regulator, and were subjected to performance test after being rolled and aged at 220 ℃ for 16 h. The detection results are shown in Table 2; it can be seen that the flow type regulator prepared in the embodiment has obvious improvement on the shear force of the drilling fluid, and shows good shear force improving performance.

[0056] Table 2 Influence of the flow type regulator prepared in the embodiment on the performance of the oil-based drilling fluid

[0057]

[0058]

[0059] 4 g of the regulator prepared in Example 2 was added into the above oil-based drilling fluid base slurry, and was subjected to performance test after being rolled and aged at 220 ℃ for 72 h. The detection results are shown in Table 3; it can be seen that the regulator prepared in Example 2 has good long-term aging stability, and the shear force of the drilling fluid changes little after 72 h of aging, and shows better temperature resistance performance, which ensures that the flow type regulator product can still significantly improve the shear force of the oil-based drilling fluid and improve the flow type of the drilling fluid under long-time high-temperature conditions.

[0060] Table 3 Influence of the flow type regulator prepared in Example 2 on the performance of the oil-based drilling fluid

[0061]

[0062] It can be known from the above embodiments that the flow type regulator for oil-based drilling fluid prepared in the embodiment has good temperature resistance performance, long action time, can significantly improve the rheological property of the oil-based drilling fluid under high-temperature conditions, improve the shear force and suspension stability of the drilling fluid, and solves the problems of barite sedimentation and poor rock carrying capacity of the high-temperature and high-density oil-based drilling fluid.

[0063] The above only describes the preferred embodiments of the present application, and it should be noted that the ordinary skilled in the art can make some improvements and refinements without departing from the principles of the present application, and these improvements and refinements should also be considered as the protection scope of the present application.

Claims

1. A method for preparing a flow pattern regulator for oil-based drilling fluid, comprising: carrying out a first reaction of a polybasic acid and a polyamine A to obtain a first reaction product; carrying out a second reaction of the first reaction product and a polyamine B to obtain a second reaction product; carrying out a third reaction of the second reaction product and a diluent to obtain a flow pattern regulator for oil-based drilling fluid; the polyamine A is selected from one or more of N,N-di(3-aminopropyl)dodecylamine, N,N-di(3-aminopropyl)tetradecylamine, N,N-di(3-aminopropyl)hexadecylamine, N,N-di(3-aminopropyl)octadecylamine and N,N-di(3-aminopropyl)oleylamine; the polyamine B is selected from one or more of m-phenylenediamine, p-phenylenediamine and 2,4,6-triethylbenzenetriamine; the polybasic acid is selected from one or more of dimerized fatty acid and trimerized fatty acid; the molar ratio of the polybasic acid to the polyamine A is 1:(0.1-2); the molar ratio of the polybasic acid to the polyamine B is 1:(0.1-0.5); the diluent is selected from one or more of laurylamine polyoxyethylene ether, oleylamine polyoxyethylene ether and octadecylamine polyoxyethylene ether.

2. The method of claim 1, wherein, the temperature of the first reaction is 100-150℃.

3. The method of claim 1, wherein, the temperature of the second reaction is 160-200℃.

4. The method of claim 1, wherein, the mass of the diluent is 50-150% of the total mass of the polybasic acid, the polyamine A and the polyamine B.

5. The method of claim 1, wherein, the temperature of the third reaction is 80-100℃.

6. An oil-based drilling fluid comprising: the flow pattern regulator for oil-based drilling fluid prepared by the method of claim 1.

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